Make audio downmixer part of the core platform

Add the multichannel audio downmix effect to the core platform, as
 it is now a core feature of the media framework.

Bug 6456547

Change-Id: I35f88f6bffc131d5fe837c3767879f2536cec05b

target/product/core.mk

@@ -75,6 +75,7 @@ PRODUCT_PACKAGES := \
     libaudiopreprocessing \
     libaudioutils \
     libcrypto \
+    libdownmix \
     libdvm \
     libdrmframework \
     libdrmframework_jni \

target/product/generic_no_telephony.mk

@@ -53,8 +53,7 @@ PRODUCT_PACKAGES += \
     librs_jni \
     libvideoeditor_jni \
     libvideoeditorplayer \
-    libvideoeditor_core \
-    libdownmix
+    libvideoeditor_core
 
 PRODUCT_PACKAGES += \
     audio.primary.default \